Chapter 4: Q. 371 (page 522)

In the following exercises, use slopes and $y$ -intercepts to determine if the lines are perpendicular.
$x - 4 y = 8; 4 x + y = 2$

Short Answer

Expert verified

The lines are perpendicular.

Step by step solution

Given information

The given equation are shown below:

$x - 4 y = 8 4 x + y = 2$

Solve both the equation for y

First, solve $x - 4 y = 8$ for $y$ .

role="math" localid="1647964053380" $\begin{array}{rcl} - 4 y & = & 8 - x \\ y & = & - \frac{x}{- 4} + \frac{8}{- 4} \\ y & = & \frac{x}{4} - 2 \end{array}$

Second solve $4 x + y = 2$ for $y$ .

role="math" localid="1647964077415" $\begin{array}{rcl} y & = & 2 - 4 x \\ y & = & - 4 x + 2 \end{array}$

Determine the lines are perpendicular or not

Compare $\begin{array}{rcl} y & = & \frac{x}{4} - 2 \end{array}$ with $y = m_{1} x + c_{1}$ .

$m_{1} = \frac{1}{4}$

Compare $\begin{array}{rcl} y & = & - 4 x + 2 \end{array}$ with $y = m_{2} x + c_{2}$ .

$m_{2} = - 4$

$\begin{array}{rcl} m_{1} m_{2} & = & \frac{1}{4} \cdot - 4 \\ = & - 1 \end{array}$

Since, the product of their slopes is $- 1$ .

Write the conclusion

The lines are perpendicular.

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In the following exercises, use slopes and $y$ -intercepts to determine if the lines are perpendicular.
$x - 4 y = 8; 4 x + y = 2$

Short Answer

Step by step solution

Given information

Solve both the equation for y

Determine the lines are perpendicular or not

Write the conclusion

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In the following exercises, use slopes and y-intercepts to determine if the lines are perpendicular.x-4y=8;4x+y=2

Short Answer

Step by step solution

Given information

Solve both the equation for y

Determine the lines are perpendicular or not

Write the conclusion

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Math Textbooks

Pure Maths

Mechanics Maths

Calculus

Decision Maths

Theoretical and Mathematical Physics

Discrete Mathematics

Study anywhere. Anytime. Across all devices.

In the following exercises, use slopes and $y$ -intercepts to determine if the lines are perpendicular.
$x - 4 y = 8; 4 x + y = 2$